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My blower works fine and the mechanism under the dash is working properly when switch from AC to heat. It won't blow warm air at all. Anybody have any suggestions on what to check next?

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Does the engine reach normal operating temp? Are the heater hoses hot? Another thought, maybe temp door under dash has a problem?

Posted on Dec 09, 2016

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2008 Jeep Liberty-My heater was barely warm-blowing fine tho. Was told I had a plugged heater core and needed a new one. Had a new heater core put in and then my air conditioner stopped blowing cold air....


I woild be checking the vent controls as if the ac is working and the core was blocked then the air would be cool when the heat was selected but not changing Fixing the heater has resulted in a /c not being good enough to cool the air if the vent is not properly selecting. The point is that if the vent selection is not working properly (vacuum hoses) then the 2 faults will be related.

Oct 24, 2013 | Jeep Liberty Cars & Trucks

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1997 ford explorer xlt. max ac works fine but when i switch to normal ac or change vent control it blows out heated air. How do i check or repair?


The blend door actuator is probably bad in it causing the warm air to blow out instead of cold air. It is behind the dash.

It may take several hours for a technician to get at it and replace the parts required for it to work again.

Aug 19, 2010 | 1997 Ford Explorer AWD

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91 ciera only does defrost, no vents or AC


i believe this is a vacuum operated system. if there is a problem with the vacuum supply to the control unit, it will automatically default to defrost. i would start by checking the vacuum source lines. good luck!

Mar 22, 2010 | 1991 Oldsmobile Cutlass Ciera

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1999 town car blower motor resistor.....maybe?


The Blower Motor Resistor is a common problem in your car but not for the problem you describe. When the Heat/AC won't blow on all speeds, the blower motor resistor is at fault. When air won't blow out of vents, bi-level, or floor the problem is the blend door actuator. This is vacuum driven and diverts the air to where you select. When air will only blow from one place (usually the defrost) then the blend door actuator is the problem. This can sometimes be corrected if there's a vacuum leak (usually under the hood in front of the passenger you'll find the vacuum line and can trace it backward to find a leak). If no leak can be found, the blend door actuator itself is defective and needs replacement.

Sep 06, 2009 | 1999 Lincoln Town Car

1 Answer

1998 FORD EXPEDITION AC/HEATER BLOWER


Common issue. Your air ducts were not reassembled properly and so the blower fan is working but the air is going out wherever the air duct is improperly fitted. Also the fan gate ( a metal gate that is used to block off any heat entering the system when you have the a/c on may be stuck in the close position. Whatever the case it can be repaired by getting in the sysem under the passenger side of the underside of the dash. You may want a professional mechanic to perform thid because it is a bit of a job to access all of the items needed. Hope this helps!!!

Feb 11, 2009 | 1999 Ford Expedition

1 Answer

Heater /ac


i had this exact same problem with my 98 explorer. your blend actuator (blend doors) are not morking. these are on the passenger side under the dash. getting to them will be dificult, but it can be done. you will need to take apart the heater box, to fix them. (the big black box under the dash).

Feb 10, 2009 | 1998 Ford Explorer

2 Answers

Heat not working


Potential easy solution; check whether there is a vacuum operated valve in the heater supply or return lines. My old v8 '84? Malibu had one. It kept coolant from circulating through the heater until the motor warmed up; helps warm the engine quicker; BUT it was stuck closed and I had no heat. Rather than purchase a new one or mess wqith the vacuum lines, my solution was to use a piece of wire (nylon zip tie might work also) to hold the thing in the open position. So the motor takes a minute longer to warm up. Else might be air embolism in the line, which could indicate combustion leak or insufficient purging of air from the system after you changed the t-stat. Good luck.

Jan 14, 2009 | 1994 Chevrolet Silverado 2500

1 Answer

Heating problem


Check the heater control valve (usually on one or both heater hoses just ahead of where they enter the firewall) make sure that the vacuum hose going to it is connected and that the actuator arm moves when you switch between ac and heat. Also make sure coolant is full and that engine comes up to operating temp.Under the dash, on the heater box there is a vacuum servo that operates an internal door. Make sure this is operating as well (same as htr valve) Likely one of these is your problem.

Dec 31, 2008 | 2001 Chevrolet Blazer

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